When ei ther the pi lot or co-pi lot keys the mi cro phone to trans mit,
all other mi cro phone in puts are muted to in sure that the keyed mi -
cro phone is the sin gle source of the trans mit ted au dio. The au dio
in puts se lected from the front panel pushbuttons are also muted
while the pi lot or co-pi lot is trans mit ting. If the pi lot and co-pi lot
should both key their mi cro phones at the same time, the pi lot’s mic
will over ride the co-pi lot’s. This pi lot mi cro phone pri or ity does
not ap ply to dual KMA 24H in stal la tions. In these in stal la tions,
each au dio panel can be keyed in de pend ent of the other.
4.12 KR 21 MARKER BEA CON
Marker bea con re ceiv ers are used to pro vide ac cu rate fixes by in -
form ing the pi lot of his pas sage over bea con sta tions lo cated on
air ways and ILS ap proach courses. Three types of bea cons are
used. They are the air ways/in ner marker, the outer marker and the
mid dle marker.
The outer, mid dle and in ner mark ers are used in con junc tion with
the ra dio in stru ment land ing sys tems. The outer marker is nor mally
po si tioned on the front lo cal izer course near the point where the
glideslope ap proach path in ter sects the min i mum in bound al ti tude
af ter the pro ce dure turn. Dis tance from the air port will vary from 4
to 7 miles. Ra dio fre quency from the marker is pro jected ver ti cally
in an el lip ti cal cone shaped pat tern. The marker sig nal is mod u -
lated at 400 Hz and is keyed to emit dashes at a rate of two per sec -
ond.
When pass ing the outer marker the blue light will flash “on/off” at
a two per sec ond rate and the pi lot will hear a se ries of low tone
dashes.
The mid dle marker is nor mally lo cated on the front lo cal izer
course about 3200 feet from the ap proach end of the ILS run way.
The ra di ated pat tern is sim i lar in shape and power to the outer
marker. The mid dle marker sig nal is mod u lated with 1300Hz and
the mod u la tion is keyed to iden tify by al ter nate dots and dashes.
When the KR 21 equipped air craft passes the mid dle marker the pi
-
lot hears a me dium pitched tone in a se ries of dots and dashes and
the am ber light flashes syn chro nously with the tones.
SCHWEIZER MODEL 269C-1 HELICOPTER
CSP-C1-1A
28 FAA Approved: 03 Oct 1995
Revised: 17 Apr 1996
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